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For example, Estonia can be solved with any of the following combinations: an/as/at/ na/ns/nt/ sa/sn/st/ ta/tn/ts. Since the letters E, I, O, and U are not allowed, the following combinations won't work: ae/ai/ao/ ea/ei/en/eo/es/et/ ia/ie/in/io/is/it/ ne/ni/no/ oa/oe/oi/on/os/ot/ se/si/so/ te/ti/to.